Antonio C. Martinez, Jr., age 40, a former Chicago cop, pleaded guilty to all counts in the recently unsealed Latin Kings indictment

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One of two Chicago Police officers accused of using their badges and uniforms to help the Latin Kings steal drugs, money and guns pleaded guilty on Friday to all charges, and has agreed to testify against others in the case.

Martinez admitted in court that he committed a series of robberies under the guise of legitimate police investigations, while wearing his Chicago Police Department badge and department-issued weapon.

Martinez told the court he committed several robberies at the direction of the Latin Kings. He also admitted to picking up and delivering packages of cocaine on multiple occasions for two different leaders of the Latin Kings.

Martinez said he physically restrained a victim during a robbery, wore a bulletproof vest and used his position as a Chicago Police officer to facilitate the robberies, the release said.

Sentencing for Martinez is set for June 14, 2012.

Martinez’s former partner, 41-year-old Alex Guerrero, is scheduled for a jury trial along with seven other defendants on March 19, 2012.